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-rw-r--r--include/linux/tty_ldisc.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index f15c898ff462..b8347c207cb8 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -84,7 +84,8 @@
* processing. <cp> is a pointer to the buffer of input
* character received by the device. <fp> is a pointer to a
* pointer of flag bytes which indicate whether a character was
- * received with a parity error, etc.
+ * received with a parity error, etc. <fp> may be NULL to indicate
+ * all data received is TTY_NORMAL.
*
* void (*write_wakeup)(struct tty_struct *);
*
@@ -118,7 +119,8 @@
* processing. <cp> is a pointer to the buffer of input
* character received by the device. <fp> is a pointer to a
* pointer of flag bytes which indicate whether a character was
- * received with a parity error, etc.
+ * received with a parity error, etc. <fp> may be NULL to indicate
+ * all data received is TTY_NORMAL.
* If assigned, prefer this function for automatic flow control.
*/